linux-kernel - Re: [PATCH] drm/amdkfd: enable kfd on RISCV systems

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Message-ID: <0b1e1a00-2cb9-4793-a439-06fcec3e71ec@amd.com>
Date: Mon, 28 Apr 2025 10:17:26 -0400
From: Felix Kuehling <felix.kuehling@....com>
To: liu.song13@....com.cn
Cc: alexander.deucher@....com, christian.koenig@....com, airlied@...il.com,
 simona@...ll.ch, amd-gfx@...ts.freedesktop.org,
 dri-devel@...ts.freedesktop.org, linux-kernel@...r.kernel.org,
 liu.xuemei1@....com.cn, jiang.xuexin@....com.cn, xue.zhihong@....com.cn
Subject: Re: [PATCH] drm/amdkfd: enable kfd on RISCV systems

On 2025-04-26 21:25, liu.song13@....com.cn wrote:
> From: Xuemei Liu <liu.xuemei1@....com.cn>
>
> KFD has been confirmed that can run on RISCV systems. It's necessary to
> support CONFIG_HSA_AMD on RISCV.

Is there a public user mode branch with any changes needed to make ROCm 
user mode work with RISCV?

One more question inline.


> Signed-off-by: Xuemei Liu <liu.xuemei1@....com.cn>
> ---
>   drivers/gpu/drm/amd/amdkfd/Kconfig | 2 +-
>   1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/gpu/drm/amd/amdkfd/Kconfig b/drivers/gpu/drm/amd/amdkfd/Kconfig
> index d3c3d3ab7225..9d4a5f8ef43f 100644
> --- a/drivers/gpu/drm/amd/amdkfd/Kconfig
> +++ b/drivers/gpu/drm/amd/amdkfd/Kconfig
> @@ -5,7 +5,7 @@
>
>   config HSA_AMD
>    bool "HSA kernel driver for AMD GPU devices"
> - depends on DRM_AMDGPU && (X86_64 || ARM64 || PPC64)
> + depends on DRM_AMDGPU && (X86_64 || ARM64 || PPC64 || RISCV)

The KFD memory model only works on 64-bit architectures. Is there a way 
to express that in the RISCV dependency?

Regards,
   Felix


>    select HMM_MIRROR
>    select MMU_NOTIFIER
>    select DRM_AMDGPU_USERPTR